Yes, it's true he didn't come out and say different endings were taped--but what would Tomlin "have in his pocket" if there was only one ending actually taped, and that being the one where everybody figured there was a good chance we'd see Dr. Baker again?

True - perhaps they taped the identical scene with no finger twitch. There is definitely some info we're missing, like what criteria Tomlin was using to determine the route of the story. Perhaps he wanted to see how the KA/CC/PR triangle went? Or perhaps it was just a re-signing/salary issue with one of the actors? They have had the issues (whatever they are) recently with PR... hmm....